268 



Trowbridge, Hmvk Flights in Connecticut. 



TAuk 



Ljuly 



had suddenly changed to a northerly direction, after a period of 

 prevailing southerly breezes, showing that the adverse winds had 

 held back the hawks and delayed their southward journey. 



An examination of the weather maps of the U. S. Weather 

 Bureau has showed that on the days when the greatest flights 

 occurred, the wind was northerly throughout New England, and 

 also that previous to these flights the wind had generally been 

 southerly for several days. 



;\(^ 



T=> 9 



Map II. Coast-line of the New Englaxd States. — The arrows 

 indicate the general direction of fliglit taken by the Hawks in tlie 

 spring, when the winds are S. W. ; and show why the migrating Hawks 

 do not pass through the southern New England States at that season in 

 any numbers. 



